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Vertical Instability in EAST: Comparison of Model Predictions with Experimental Results 被引量:1
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作者 钱金平 万宝年 +6 位作者 沈飙 肖炳甲 孙有文 石跃江 林士耀 李建刚 龚先祖 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第3期290-293,共4页
Growth rates of the axisymmetric mode in elongated plasmas in the experimental advanced superconducting tokamak (EAST) are measured with zero feedback gains and then compared with numerically calculated growth rates... Growth rates of the axisymmetric mode in elongated plasmas in the experimental advanced superconducting tokamak (EAST) are measured with zero feedback gains and then compared with numerically calculated growth rates for the reconstructed shapes. The comparison is made after loss of vertical position control. The open-loop growth rates were scanned with the number of vessel eigenmodes, which up to 20 is enough to make the growth rates settled. The agreement between the growth rates measured experimentally and the growth rates determined numerically is good. The results show that a linear RZIP model is essentially good enough for the vertical position feedback control. 展开更多
关键词 vertical instability growth rate tokamak plasma
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Effect of passive plates on vertical instability in the EAST tokamak 被引量:1
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作者 刘广君 万宝年 +6 位作者 钱金平 孙有文 肖炳甲 沈飚 罗正平 戟翔 陈树亮 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第8期323-329,共7页
The effect of passive plates on vertical displacement control in the EAST tokamak is investigated by open loop experiments and numerical simulations based on a rigid displacement model. The experiments and simulations... The effect of passive plates on vertical displacement control in the EAST tokamak is investigated by open loop experiments and numerical simulations based on a rigid displacement model. The experiments and simulations indicate that the vertical instability growth rate is reduced by a factor of about 2 in the presence of the passive plates, where the adjacent segments are not connected to each other. The simulations also show that the vertical instability growth rate is reduced by a factor of about 10 if all adjacent segments on each passive plate loop are connected to each other. The operational window is greatly enlarged with the passive plates. 展开更多
关键词 passive plate vertical instability rigid displacement model
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Control of the Vertical Instability in the SUNIST Spherical Tokamak
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作者 曾龙 高喆 何也熙 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第3期265-268,共4页
Control of the vertical instability of the plasma in the SUNIST spherical tokamak is studied. A proportional-derivative (PD) position controller is employed in a control system which consists of a massless plasma, a... Control of the vertical instability of the plasma in the SUNIST spherical tokamak is studied. A proportional-derivative (PD) position controller is employed in a control system which consists of a massless plasma, active coils and a passive conducting vessel. Stability conditions axe determined and the feedback control with different combinations of both active and passive coils, available on SUNIST, is emphasized. The simulation results are also discussed. 展开更多
关键词 SUNIST vertical instability active coils eddy current
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H_∞Loop Shaping Control for Plasma Vertical Position Instability on QUEST
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作者 刘晓龙 Kazuo NAKAMURA +12 位作者 Tatsuya YOSHISUE Osamu MITARAI Makoto HASEGAWA Kazutoshi TOKUNAGA 薛二兵 Hideki ZUSHI Kazuaki HANADA Akihide FUJISAWA Hiroshi IDEI Shoji KAWASAKI Hisatoshi NAKASHIMA Aki HIGASHIJIMA Kuniaki ARAKI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第3期295-299,共5页
QUEST has a divertor configuration with a high and a negative n-index, and the problem of plasma vertical position instability control in QUEST is still under extensive study for achieving high efficiency plasma. The ... QUEST has a divertor configuration with a high and a negative n-index, and the problem of plasma vertical position instability control in QUEST is still under extensive study for achieving high efficiency plasma. The instability we considered is that the toroidal plasma moves either up or down in the vacuum chamber until it meets the vessel wall and is extinguished. The actively controlled coils (HCU and HCL) outside the vacuum vessel are serially connected in feedback with a measurement of the plasma vertical position to provide stabilizing control. In this work, a robust controller is employed by using the loop synthesis method, and provides robust stability over a wide range of n-index. Moreover, the gain of the robust controller is lower than that of a typical proportional derivative (PD) controller in the operational frequency range; it indicates that the robust controller needs less power consumption than the PD controller does. 展开更多
关键词 vertical position instability robust control loop shaping QUEST
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Simulation of the Growth Rate of Vertical Displacement Events and the Requirement of Active Feedback Power Supply in EAST
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作者 刘磊 肖炳甲 罗正平 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第1期28-32,共5页
An axisymmetric rigid plasma RZIP model for the EAST electromagnetic system is developed. Based on this model, the open loop vertical growth rates for various EAST equilibrium configurations generated by EFIT are calc... An axisymmetric rigid plasma RZIP model for the EAST electromagnetic system is developed. Based on this model, the open loop vertical growth rates for various EAST equilibrium configurations generated by EFIT are calculated and the closed loop stability is analyzed. The design of the PD (proportional and derivative) feedback controller and the requirement for the fast control power supply are also discussed. 展开更多
关键词 vertical instability feedback control power supply SIMULATION
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The stability margin on EAST tokamak 被引量:1
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作者 钱金平 万宝年 +3 位作者 沈彪 M.L.Walker D.A.Humphreys 肖炳甲 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第6期2432-2440,共9页
The experimental advanced superconducting tokamak (EAST) is the first full superconducting tokamak with a D-shaped cross-sectional plasma presently in operation. Its poloidal coils are relatively far from the plasma... The experimental advanced superconducting tokamak (EAST) is the first full superconducting tokamak with a D-shaped cross-sectional plasma presently in operation. Its poloidal coils are relatively far from the plasma due to the necessary thermal isolation from the superconducting magnets, which leads to relatively weaker coupling between plasma and poloidal field. This may cause more difficulties in controlling the vertical instability by using the poloidal coils. The measured growth rates of vertical stability are compared with theoretical calculations, based on a rigid plasma model. Poloidal beta and internal inductance are varied to investigate their effects on the stability margin by changing the values of parameters αn and γn(Howl et al 1992 Phys. Fluids B 4 1724), with plasma shape fixed to be a configuration with k = 1.9 and 5 = 0.5. A number of ways of studying the stability margin are investigated. Among them, changing the values of parameters κ and li is shown to be the most effective way to increase the stability margin. Finally, a guideline of stability margin Ms(ki, li, A) to a new discharge scenario showing whether plasmas can be stabilized is also presented in this paper. 展开更多
关键词 vertical instability growth rate stability margin
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